Rotary kiln.



M. G. SEMPER. ROTARY KILN. APPLIUATION FILED JUNE 17, 190s.

Patented Jan. 12, 1909.

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ROTARY KILN.

Specification of Letters Patent.

Patented Jan. 12, 1909.

Application led June 17, 190B. Serial No. 438,911.

To all whom it muy concern:

lli it known that l. ltwrnnn (lo'r'rl-nncn Saurier, engineer, citizen ot' the Swiss Con 'I'wlerationresidinjbY al lll-tellingen. Prov inco of Saxony` Germany, have inwntml new and useful Improvements in Rotary Kihei. ot' which the i'ollowu'igr 1s a specificat lon.

This` invention relates lo a process andv apparatus lor producing as high tempera tures as possible in rotary kilns heated by oas.

The object ot the process forming the a|bjtct-matter ot' the present application is to heat rotary kilns by means of gas by compellingr the gases repeatedly to pass through the @linker zone or to 'forni eddies in order thus to obtain a comparatively high tenuierature over a short distance, flamesl being freely produced.

ln order to make this process profitable the rotary kilns must be suitably modified by very materially reducing the cross-sectional area of the end of the clinker zone, where a contracted place is formed. The gases which rush through the kiln at a high rate of speed ineet. al the lace of contraction, rebound and cause ed ies in the clinker zone, said eddies producingr a high temperature.

In theaccompanying drawin s Figure 1 shows a longitudinal section t rough the kiln, and Fig. l a modified form of the contracted part of the kiln.

The rotary kiln a is lined with refractory material L in a well known manner and opens into a flue o through which runs the feed-pipe d. At the front end of the rotary kiln is the discharge-chamber f through which the gas admission-pipe g is led into the kiln. The clinker zone h situate ln the front )art of the kiln terminates at the contracted place The shape of this contracted part may vary. For instance the. front surface may be conical and slope from the center backwards towards the rear end of the kiln, so that the contracted passage of the kiln is undercut at that oint, as shown in Fig. l, the result of whic is that the gas is devated as much as possible. The conical front surface may also slope from the center forwards, as shown in Fig. 2, whereby udrlics will also be produced in the clinker zone. The hack portion of the contracted part either slopes back steeply, that is, at a considemibhl angle to the longitudinal axis of the kiln. as shown in Fig. 2, or it slopes back gently, as .shown in Fig. l, whereby a long incline is provided along; which the material under treatment passes into the clinker zone without falling' into a dead space. that is, a space in which it remains unaffected.

The material runs into the rotary kiln tl'irougli the pipe d in a well known manner and leaving the calcining zone traverses the place of contraction and enters the clinker zone. Gas is supplied from the opposite end ot the kiln and the clinkerirngr of the material. is accomplished by the eddies produced in the clinker zone after which the material is run ofl' in the ordinary manner.

The construction of the contracted part of the kiln may vary, but it is essential that it be situated at the end of the clinker zone so that the gases are made to eddy.

l/Vhat I claim as my invention and desire to .secure by Letters Patent is 1 1, A rotary kiln, comprising a plurality of chambers in connnnnlcation, one of said chambers being larger than the others, means ada )lcd to introduce a current of gas into sai( larger chamber, and means in said larger chamber adapted to obstruct the passage of the gas, said means comprising a conical baille the apex of which faces the current of gas. Y

*2. A rotary kiln, comprising a plurality of chambers in communication, one of Said cl'iai'nbers being larger than the others, and nieans'adapted to introduce a 4current of gas into said larger chamber, said larger chamber, at the end adjacent its connections with the smaller chamber, being conically recessed and adapted to obstruct the passage of the gas.

MANFRED GOTTFRIED SEMIER.

Witnesses:

D. RICHARD RomNow, ERNEST H. L. MUMMENHOFF. 

